Super Stumped with this Thumping/Knocking Noise

I'm really in need of some help here fellas, my cousin has a 2002 Double Cab Pre Runner 2wd auto. Has around 147k and is super clean, runs great etc..

After the truck warms up it starts to make a thumping or rubbing/ knocking noise that you can hear prominently from the inside of the cab and does it when the truck is in gear. When its in neutral it mostly goes away. He runs 93 oct. It still runs great and has power, it is not a rod knock.

Things that have been done in the past month or 2 trying to solve this:

- timing belt
- hydraulic tensioner
- all other belts
- water pump
- all the pulleys (idler/tensioner)
- thermostat and gasket
- cam and crank seals
- fresh oil change
- fresh Denso plugs
- SeaFoam in tank and induction

This is a mechanic owned truck and we're pretty much stumped. Any and ALL help would be much appreciated. - Drew

 

Help us ... help you bro'... Ya gotta get some audio posted with the mystery noise before anything can be assertained...

 

True that.. Ill have to wait till tomorrow to do that but i could upload a youtube link for sure

 

First thing I would do is remove all the belts from the alt, power steering etc and try to isolate it.

 

I already did that

 

is it mainly when the truck is warmed up and you come to a quick stop?

 

So it doesn't do it sitting still only when the drive line is rotating.

 

Loose or broken motor or transmission mount?
-Bill-

 

This.

 

It does it sitting still, as you accelerate it goes away.. I was going to upload a video but you can't hear it thru my iphone speaker.

 

I was thinking maybe oil pump or something with the torque converter

 

I'm going to check into this also, it may have been overlooked

 

When I had a torque converter problem it really didn't make sounds. It just acted like a first timer trying to drive a manual tranny... really really bad driving.

 

I am not the only one with this problem. I have found very similar stories on this forum and on other sites but no one has an answer. Hopefully I can figure this out soon and will start a thread explaining the issue and how I fixed it

 

I have the same problem, it only makes the noise when the engine is under a load (drive or reverse) the car does not have to be moving

-tomorrow morning im going to place all accesory belts (needs replacing anyways) i read on other toyota forums that if the belts are too tight it can make the ticking/thunping noise also

-another guy on another toyota forum had the same problem and it ended up being a severly cracked flex plate, so im going to check that also

I hope this solves mines and your problem, i'll keep u guys updated on what i find out.

-

 

Any resolution to this problem? Mine has the same exact problem.

 

I have checked everything i can and done everything i can except rebuild the motor...the noise is still there, but does not effect the motor in anyway.

I did notice that the sound went away or got very low in the winter time..

Another thing i notice:

I almost think this sound might be normal? My co-worker has a 02 tundura v8 and he has the same exact sound coming from his motor also.
And then about a month ago i was in lake tahoe, ca. I forget what the place is called but you see the lake from there, anyways there was a lot of cars there and as i was standing there i heard the noise..so i turned around and it was the same exact noise but it was coming from a 2008-9? Nissan armada!!

So i dont know..i think i myself will just accept it to be normal...i spent alot of money on it trying to figure it out and i have come to the conclusion that if it is a problem its an internal problem and i dont want to deal with that, BUT i dont think there is a problem.

If you look at my last post (2 posts up) which was almost a year ago...the truck still runs like a champ with the noise..

 

To the Op, did this start after you replaced all the timing belt components?

 

What parts has everyone used? Aftermarket or OEM